#include <REGX52.H>
#include "Delay.h"

/**
  * @brief   获取独立按键键码值
  * @param   无
  * @rtval   按下按键的键码
  */
unsigned char Key()
{
	unsigned char KeyNum=0;
	if(P3_1 == 0){Delay(20);while(P3_1==0);KeyNum=1;}
	if(P3_0 == 0){Delay(20);while(P3_0==0);KeyNum=2;}
	if(P3_2 == 0){Delay(20);while(P3_2==0);KeyNum=3;}
	if(P3_3 == 0){Delay(20);while(P3_3==0);KeyNum=4;}
	
	return KeyNum;
}